I finally got on the iPod bandwagon a few months ago and purchased the lime green 4g Nano. This little gadget has transformed my work day! I love listening to podcasts, so now I make sure I have at least 3 hrs worth loaded into my iPod when I go to work each day. It really helps the afternoon fly by! I love listening to music too. It can hold enough songs for me to listen to them back to back for days on end. Both iTunes and the iPod are very user-friendly and I love the number of accessories you can buy to go along with it.
Now, a few negatives...I would definitely suggest you purchase some sort of cover for your iPod as soon as you get it, as the surface is very easily scratched. Also, mine tends to freeze up at least once a day. It is easily fixed...you just hold down the middle button and the menu button at the same time until it resets and then it works just fine. It is a bit of a nuisance though. Also, the headphones that come with it are terrible. I just purchased some JVC Marshmallow earbuds and use those instead. LOVE those!
All in all, I would recommend the iPod Nano to just about anyone. I've only had mine a few months and I already can't figure out what I ever did without it.